Windows 10: Endless Reboot

Endless Reboot

Hello everyone,
I downloaded and installed the updates and, when it asked me to reboot, I did. However, I had to leave the house, so I left it to restart. When I came back almost 6 hours later I saw the black screen with the dots moving in a circle indicating some sort of processing.
I let it work, and now it's been about 20 hours since I restarted it yesterday.
I searched the forum, but couldn't find any similar topic.
Does anyone know how long approximately it's supposed to take?
What would you do? Should I force it to shut down and turn it on again and hope it goes well?
I really need your opinion guys. I had a very bad experience with one of the windows upades 2 years ago.
My system is kind of old, but works fine. It has 8 gb of RAM and Dual-Core 500 gb HDD.
Any suggestion would be very much appreciated.

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Updating Windows 10 would not take 20 hours its stuck for sure you should restart your computer and hopefully this will resolve the issue.
If the issue will not resolve by restarting computer follow below troubleshooting steps.

A quick fix for the loop error could be booting into the Last Known Good Configuration mode:

At the Advanced Boot Options screen, select Last Known Good Configuration (advanced)

Press Enter key.

If this fix doesn’t solve the loop error, try any of the following fixes below.

Delete cleanup.xml and pending.xml
The Windows Update loop can be fixed in most cases by deleting the following files found in the \Windows\WinSxS\ folder:

If deleting pending.xml and cleanup.xml doesn’t work, use the DISM command:

Code:

dism /image:C:\ /cleanup-image /revertpendingactions

Where C: is the drive where Windows 8/8.1/10 is installed.

Please replace partition letter C: with Windows installed partition letter. When computer boots into Windows Recovery Environment (WinRE) environment the drive letter assign to Windows partition may not be C: drive letter because Windows 7, 8 , 8.1 and 10 creates a separate system partition when it's installed from scratch. The system partition contains boot files WinRE assigns the system partition the C: drive letter and the Windows installed partition will be assign any other drive letter usually D: drive letter is assign to Windows installed partition. The Bcdedit /enum | find "osdevice" command can be use to find out the drive letter of the Windows installed partition the output of the Bcdedit command is similar to this osdevice partition=D:. The drive letter after partition= is the drive letter of the Windows partition.

If System Restore was enabled and running on your system, you can try to restore your computer to an earlier date to access Windows. You can try boot your computer into Safe Mode and use System Restore tool. You can also use System Restore tool from Windows Recovery Environment

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Just to keep you updated..
I forced my laptop to shut down, and turned it on again. It resumed installation from 30% on a green screen and now it's at 51%.
Will let you know how it ends up after it gets somewhere.
Thank you @FreeBooter and @dalchina for giving me the courage to do this, and for all the useful information.
Will keep you posted for sure.

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